Class 423/372 - Hydrogen cyanide

Subclass of Class 423 - Chemistry of inorganic compounds
Definition: Products or processes in which the product is hydrogen cyanide
No. of patents: 23
Last issue date: 11/13/2007

Number	Title	Issue Date
7294325	Method for the production of hydrocyanic acid by oxidation of nitrogen-containing hydrocarbons in a flame A process is described for preparing hydrogen cyanide by autothermal noncatalytic oxidation of one or more nitrogenous hydrocarbons or a nitrogenous hydrocarbon mixture in which the nitrogenous hydrocarbons, an oxygen-containing gas, with or without ammonia, with or...	11/13/2007
7179433	Production process and production apparatus for polybutylene terephthalate An apparatus for continuously producing polybutylene terephthalate, which comprises a first reactor for reacting an aromatic dicarboxylic acid with a glycol, thereby producing an oligomer, a second reactor for polycondensating the oligomer, thereby preparing a low p...	02/20/2007
7101525	Catalytic device for the implementation of a reaction in a gaseous medium at high temperature The present invention relates to a catalytic device for the implementation of a reaction in a gaseous medium at high temperature, such as, for example, the synthesis of HCN or the oxidation of ammonia, comprising: at least one textured material (1) which is e...	09/05/2006
7063827	Process for producing hydrogen cyanide A conical reactor head for use in chemical processes or other systems is provided. The reactor head includes a robust internal insulator to boost efficiency while maintaining safety by allowing the reactor head to self-radiate at high temperatures. The reactor head ...	06/20/2006
6793776	Operation of heads column A process for the enhanced recovery and operation of hydrogen cyanide (HCN)/heads column obtained from the reactor effluent of an ammoxidation reaction of propane, propylene or isobutylene by reducing the polymer formation above the feed tray in the heads tower....	09/21/2004
6649134	Method and apparatus for reducing nitrous oxide A process and a device for reducing the nitrous oxide which is formed during the catalytic combustion of ammonia and oxygen to form nitrogen oxides. A catalyst system including at least one first catalyst mesh element and at least one second catalyst mesh...	11/18/2003
6649137	Apparatus with improved safety features for high temperature industrial processes A conical reactor head for use in chemical processes or other systems is provided. The reactor head includes a robust internal insulator to boost efficiency while maintaining safety by allowing the reactor head to self-radiate at high temperatures. The re...	11/18/2003
6200545	Cyanide recovery by solvent extraction The invention provides a process for recovering hydrogen cyanide from an aqueous solution by extracting the hydrogen cyanide into an organic solvent phase. The organic solvent may comprise a neutral organophosphorous compounds, such as compounds selected ...	03/13/2001
6123852	Method for the adsorptive extraction of hydrocarbons from aqueous solutions of hydrocyanic acid According to this method for the adsorptive extraction of hydrocarbons from aqueous solutions of hydrocyanic acid, the initial solutions containing 1 to 50 wt. % hydrocyanic acid and 2 to 1000 wt. ppm aliphatic and/or aromatic hydrocarbons, the latter hav...	09/26/2000
6042799	Coproduction of acetylene and hydrocyanic acid from acrylonitrile In the process for preparing acetylene and hydrocyanic acid by pyrolyzing acrylonitrile in a reactor, the gaseous reaction products of the pyrolysis are quenched down to less than 100° C. immediately, advantageously within seconds, preferably within ࣘ1...	03/28/2000
5961945	Method of producing cyano compounds by ammoxidation An ammoxidizable compound is reacted with an ammonium salt, especially an inorganic ammonium salt, in the presence of a source of oxygen and an ammoxidation catalyst at 100 to 700° C., preferably 200 to 700° C., in order to produce cyano compounds of th...	10/05/1999
5364605	Recovery of cyanide from precious metal tailings Process for recovering cyanide values from a mill tailings stream remaining after gold and silver have been leached from an ore, by treating the tailings stream containing both ore insolubles and remaining cyanide leachant, without a preliminary filtratio...	11/15/1994
5356603	Method for the production of hydrocyanic acid using a corrugated catalyst This invention is a method for producing hydrocyanic acid by using an element which comprises a foraminous structure fabricated from a material consisting essentially of a metal selected from the group consisting of platinum, rhodium, palladium and alloys...	10/18/1994
5262145	Catalyst for ammonia conversion to HCN The manufacture of hydrogen cyanide by the catalytic reaction of air/oxygen, ammonia and a hydrocarbon gas employing an improved catalytic reaction zone comprising a sequential array of layers/piles in which the surface density of the catalyst in layers/p...	11/16/1993
4895659	Method for metal and cyanide recovery from plating baths and rinse waters A method for recovery of metal and cyanide from plating baths and rinse waters includes formation of hydrogen cyanide by acid treatment of such solutions, followed by HCN removal through diffusion across a microporous membrane. The method is applicable in...	01/23/1990
4745207	Preparation of the reaction products of hydrogen cyanide Reaction products of hydrogen cyanide are prepared by a process in which hydrogen cyanide prepared in a conventional manner by pyrolysis at from 250° to 650° C. over a solid under from 5 to 200 mbar is cooled to a temperature of from 200° to -10° C. t...	05/17/1988
4737290	Gel for the separation of useful components contained in rhodanate-containing detoxication treated liquid and method of separation using said gel The present invention provides a gel having excellent separation ability, operability and a long life, for separating useful components from a rhodanate-containing detoxication treated liquid. The gel consists of a cross-linked polymer with more than 50 w...	04/12/1988
4732609	Recovery of cyanide from waste waters by an ion exchange process A process is described for the substantially complete recovery of cyanide reagent and metal forming water soluble metal-cyanide complexes contained in mill effluents and waste waters. The process is comprised of a loading cycle wherein the metal-cyanide c...	03/22/1988
4587110	Process of recovering copper and of optionally recovering silver and gold by a leaching of oxide- and sulfide-containing materials with water-soluble cyanides A process is described by which copper and optionally silver and gold are recovered from sulfide and oxide ores, concentrates or slag, which contain the metals. The particulate materials are treated with an aqueous solution of an alkali cyanide or alkalin...	05/06/1986
4461751	Processes for carrying out catalytic endothermic high-pressure gas reactions Processes for carrying out catalytic exothermic and endothermic high-pressure gas reactions with a single-walled pressure vessel or shell containing cross-flow (e.g., radial flow) heat transfer exchangers, a continuous catalytic bed having at least two st...	07/24/1984
4136156	Production of HCN from organic nitriles Hydrogen cyanide is produced by reacting an organic nitrile with hydrogen at temperatures of 400-700° C in the presence of selected catalysts. Exemplary is the reaction of benzonitrile and hydrogen at 600° C in the presence of chromia on alumina to prod...	01/23/1979
4029744	Process for removing the salt of a weak acid and a weak base from solution The salt of a weak acid and a weak base is removed from a solution by contacting said solution with an emulsion. Said emulsion comprises an exterior phase which is characterized as immiscible with said solution and permeable to the weak acid and/or weak b...	06/14/1977
3975502	Process for recovery of hydrogen cyanide An improved process for recovery of hydrogen cyanide contained in a gaseous mixture is provided which comprises (a) contacting the gaseous mixture with an aqueous solution of an alkali metal carbonate to form an aqueous solution of the alkali metal cyanid...	08/17/1976

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Class 423/372 - Hydrogen cyanide